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Hi Karen, > There used to be flags to control how the parallel open was performed > (nf90_mpiio and nf90_mpiposix). These appear to be gone altogether. What > is the strategy now. I had been using nf90_mpiio and need to figure out a > way to maintain builds against both source bases. Is this the change that caused these not to work? https://www.unidata.ucar.edu/jira/browse/NCF-135 If so, maybe this example at the bottom of that bug report shows how to do it? Note Fortran test code shows how to call from Fortran with a communicator that will work: nf90_create(path="/tmp/test.nc", cmode=IOR(NF90_NETCDF4, NF90_MPIIO), ncid=ncid, & comm=MPI_COMM_WORLD, info=MPI_INFO_NULL) --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: FIU-947657 Department: Support netCDF Priority: Normal Status: Closed